However, coal is usually assumed to be an isotropic medium in the traditional coal seismic exploration, and the impacts of fractures on seam are not taken into account.
传统的煤田地震勘探将煤层假设为单一的各向同性介质，没有考虑其中裂隙对煤层的影响。
On the basis of probability integration method for flat coal seam, the paper discusses surface subsidence random medium model for mining inclined seams with an Angle of a.
在水平煤层概率积分法的基础上，讨论了开采倾角为口的倾斜煤层的地表下沉随机介质模型。
This paper summarizes the organization and key technology of rapid construction medium and large head chamber in thick seam, and provides valuable experience for the project under similar condition.
本文全面总结了厚煤层中大型机头硐室快速施工的组织及关键技术技巧，为在同类条件下施工类似工程提供了宝贵经验。
The specific calculated data of mining technology in the steeply pitching medium thick coal seam and it's application effect in real construction are introduced.
介绍了急倾斜中厚煤层回采工艺的具体计算数据，以及在实际施工中的应用效果；同时介绍了采后沿空留巷的施工方法。
Welding seam should be numbered according to pipeline medium set, in principle, main pipe prior to branch pipe.
焊缝编号应根据管线介质流向进行编号，原则上应先主管后支管。
The technology of coal plough have been applied in the exploitation of medium-sized and thin coal seam through analysing and comparing the characteristic of cylinder mining machine and coal plough.
对比分析了滚筒采煤机与刨煤机的特性，并将刨煤机开采技术运用于中等及薄煤层的开采中，提高了煤炭生产效率，实现了工作面采煤的全部自动化，具有广泛的推广和应用价值。
Space vector control algorithm makes the motor to apply torque to the seam for different materials, which can meet all requirements for light, medium and thick material.
先进的矢量控制让电机轻松保持最佳工作状态，能适应各种中厚料负载。
There is widespread coal seam of Permo-Carboniferous in Jiyang Depression. The coal has good quality, moderate evolution degree resulted in the foundation of forming medium coal-derived gas reservoir.
济阳坳陷石炭-二叠系煤层分布广泛，煤质优良，演化程度适中，具有形成中型煤成气藏的基础。
In the part of west flank of Lujiatuo minefield, the normal siltstone roof of coal seam 8 changed into coarse to medium-grained sandstone, and also had phenomenon of coal seam pinch-out.
吕家坨井田西翼部分区域八煤层顶板由正常的粉砂岩变为粗中砂岩，并有煤层变薄现象。
The article introduces the shortwall mining method along strike in medium-thickness seam with great dip angle, which is based on individual hydraulic prop and has brought great economic effect.
在大倾角中厚煤层推行走向短壁采煤方法，使用单体液压支柱，取得较好的技术经济效果。
The article introduces the shortwall mining method along strike in medium-thickness seam with great dip angle, which is based on individual hydraulic prop and has brought great economic effect.
在大倾角中厚煤层推行走向短壁采煤方法，使用单体液压支柱，取得较好的技术经济效果。
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